re PR c/32102 (-Wall stomps on -Wstrict-overflow)

2008-01-22  Manuel Lopez-Ibanez  <manu@gcc.gnu.org>

        PR 32102
        * doc/invoke.texi (-Wall): -Wall enables -Wstrict-overflow=1.
        * flags.h (warn_strict_aliasing): Remove.
        (warn_strict_overflow): Remove.
        * opts.c (warn_strict_aliasing): Remove.
        (warn_strict_overflow): Remove.
        * c-opts.c (c_common_handle_option): -Wall only sets
        -Wstrict-aliasing or -Wstrict-overflow if they are uninitialized.
        (c_common_post_options): Give default values to -Wstrict-aliasing
        and -Wstrict-overflow if they are uninitialized.
        * common.opt (Wstrict-aliasing): Specify Var and Init.
        (Wstrict-overflow): Likewise.

testsuite/
        * gcc.dg/Wstrict-overflow-21.c: New.
        * g++.dg/warn/Wstrict-aliasing-8.C: New.

From-SVN: r131720

1 files changed, 9 insertions, 2 deletions

diff --git a/gcc/c-opts.c b/gcc/c-opts.c
index ee9b7ac..4cb7687 100644
--- a/gcc/c-opts.c
+++ b/gcc/c-opts.c
@@ -401,9 +401,11 @@ c_common_handle_option (size_t scode, const char *arg, int value)
       warn_return_type = value;
       warn_sequence_point = value;	/* Was C only.  */
       warn_switch = value;
-      set_Wstrict_aliasing (value);
+      if (warn_strict_aliasing == -1)
+	set_Wstrict_aliasing (value);
       warn_address = value;
-      warn_strict_overflow = value;
+      if (warn_strict_overflow == -1)
+	warn_strict_overflow = value;
       warn_array_bounds = value;
 
       /* Only warn about unknown pragmas that are not in system
@@ -1090,6 +1092,11 @@ c_common_post_options (const char **pfilename)
   if (warn_pointer_sign == -1)
     warn_pointer_sign = 0;
 
+  if (warn_strict_aliasing == -1)
+    warn_strict_aliasing = 0;
+  if (warn_strict_overflow == -1)
+    warn_strict_overflow = 0;
+
   /* -Woverlength-strings is off by default, but is enabled by -pedantic.
      It is never enabled in C++, as the minimum limit is not normative
      in that standard.  */